Question

why NO2 is formed while the valency of nitrogen is 3​

Answer 1

Explanation:

Let the valency of nitrogen is X.

In NO :

X +{ 1× (-2)} = 0

X=+2

In NO2 :

X+{2×(-2)}=0

X=+4

In N2O:

(2×X)+{ 1×(-2)}=0

Hence X=+1

Therefore, Oxidation state of nitrogen in NO is +2 ,in NO2 is +4 and in N2O is +1 .